fix: Wrap math formulas in math blocks in retry config guide

This ensures proper rendering of the delay and jitter formulas.

Co-authored-by: Bo Yang <ybo@google.com>
PiperOrigin-RevId: 934409270

Author: boyangsvl

docs/guides/workflow/retry_config/index.md

@@ -7,6 +7,7 @@
 In distributed systems and AI workflows, transient failures (such as network glitches, rate limits, or temporary service outages) are common. `RetryConfig` allows developers to define a resilient policy for individual nodes. When a node execution fails with a configured exception, the ADK will automatically retrying the node execution according to the specified delay and backoff strategy, before propagating the failure.
 
 Key benefits:
+
 - **Resilience**: Automatically recovers from transient errors.
 - **Configurable Backoff**: Supports exponential backoff to avoid overwhelming downstream services.
 - **Jitter**: Introduces randomness to retry delays to prevent thundering herd problems.
@@ -38,28 +39,34 @@ async def call_unstable_api(node_input: str):
 
 When a node configured with `RetryConfig` raises an exception during execution:
 
-1.  **Exception Matching**: The `NodeRunner` catches the exception and checks if it matches any of the types specified in `RetryConfig.exceptions`. If `exceptions` is `None` (the default), it matches all exceptions.
-2.  **Attempt Count Check**: It checks if the current attempt count is less than `max_attempts`.
-3.  **Delay Calculation**: If a retry is warranted, it calculates the delay:
+1. **Exception Matching**: The `NodeRunner` catches the exception and checks if it matches any of the types specified in `RetryConfig.exceptions`. If `exceptions` is `None` (the default), it matches all exceptions.
+1. **Attempt Count Check**: It checks if the current attempt count is less than `max_attempts`.
+1. **Delay Calculation**: If a retry is warranted, it calculates the delay. The delay is capped at `max_delay`.
+
+```math
     $$\text{delay} = \text{initial\_delay} \times (\text{backoff\_factor}^{\text{attempt} - 1})$$
-    The delay is capped at `max_delay`.
-4.  **Jitter Application**: If `jitter` is enabled (greater than 0.0), a random offset is added to the delay:
+```
+
+4. **Jitter Application**: If `jitter` is enabled (greater than 0.0), a random offset is added to the delay. The final delay is guaranteed to be non-negative.
+
+```math
     $$\text{delay} = \text{delay} + \text{random}(-jitter \times \text{delay}, jitter \times \text{delay})$$
-    The final delay is guaranteed to be non-negative.
-5.  **Execution Pause and Retry**: The runner sleeps for the calculated delay and then re-executes the node's logic.
+```
+
+5. **Execution Pause and Retry**: The runner sleeps for the calculated delay and then re-executes the node's logic.
 
 ## Configuration options
 
 `RetryConfig` is a Pydantic model with the following fields:
 
-| Field | Type | Default | Description |
-| :--- | :--- | :--- | :--- |
-| `max_attempts` | `int \| None` | `5` (if omitted) | Maximum number of attempts, including the original request. If `0` or `1`, retries are disabled. |
-| `initial_delay` | `float \| None` | `1.0` | Initial delay before the first retry, in seconds. |
-| `max_delay` | `float \| None` | `60.0` | Maximum delay between retries, in seconds. |
-| `backoff_factor` | `float \| None` | `2.0` | Multiplier by which the delay increases after each attempt. |
-| `jitter` | `float \| None` | `1.0` | Randomness factor for the delay. Set to `0.0` to disable jitter (deterministic delays). |
-| `exceptions` | `list[str \| type[BaseException]] \| None` | `None` | Exceptions to retry on. Can be exception classes or their string names. `None` means retry on all exceptions. |
+| Field            | Type                                       | Default          | Description                                                                                                   |
+| :--------------- | :----------------------------------------- | :--------------- | :------------------------------------------------------------------------------------------------------------ |
+| `max_attempts`   | `int \| None`                              | `5` (if omitted) | Maximum number of attempts, including the original request. If `0` or `1`, retries are disabled.              |
+| `initial_delay`  | `float \| None`                            | `1.0`            | Initial delay before the first retry, in seconds.                                                             |
+| `max_delay`      | `float \| None`                            | `60.0`           | Maximum delay between retries, in seconds.                                                                    |
+| `backoff_factor` | `float \| None`                            | `2.0`            | Multiplier by which the delay increases after each attempt.                                                   |
+| `jitter`         | `float \| None`                            | `1.0`            | Randomness factor for the delay. Set to `0.0` to disable jitter (deterministic delays).                       |
+| `exceptions`     | `list[str \| type[BaseException]] \| None` | `None`           | Exceptions to retry on. Can be exception classes or their string names. `None` means retry on all exceptions. |
 
 ## Advanced applications